Helping cats and dogs live their healthiest lives.
Sacred Birman kitten stood next to an adult Yorskhire Terrier in black and white.

Contains hydrolyzed milk protein and L-tryptophan to help manage cats exhibiting fearful behaviors in stressful environments and social situations.

Founded by a veterinarian, Royal Canin has over 40 years experience in Health Nutrition. Our work with veterinarians, pet nutritionists, breeders and cat professionals from around the world has provided us with knowledge about the specific nutritional requirements of cats. This knowledge has allowed us to formulate the precise diet for your cat's special needs.

Chicken by-product meal, corn gluten meal, brewers rice, wheat, corn, pea fiber, natural flavors, dried chicory root, wheat gluten, fish oil, chicken fat, salt, calcium sulfate, sodium bisulfate, potassium chloride, sodium pyrophosphate, DL-methionine, vegetable oil, psyllium seed husk, monocalcium phosphate, fructooligosaccharides, choline chloride, vitamins [DL-alpha tocopherol acetate (source of vitamin E), niacin supplement, D-calcium pantothenate, biotin, pyridoxine hydrochloride (vitamin B6), riboflavin supplement, thiamine mononitrate (vitamin B1), vitamin A acetate, folic acid, vitamin B12 supplement, vitamin D3 supplement], taurine, L-tryptophan, dried hydrolyzed casein, trace minerals [zinc proteinate, zinc oxide, manganese proteinate, ferrous sulfate, manganous oxide, copper sulfate, calcium iodate, sodium selenite, copper proteinate], L-carnitine, marigold extract (Tagetes erecta L.), rosemary extract, preserved with mixed tocopherols and citric acid.

Calorie Content

This diet contains 3350 kilocalories of metabolizable energy (ME) per kilogram or 322 kilocalories ME per cup on an as fed basis (calculated).

Crude Protein (min)32.0%
Crude Fat (min)9.0%
Crude Fiber (max)6.8%
Moisture (max)8.0%
Tryptophan (min)0.31%
Calcium (max)1.4%
Phosphorus (max)1.3%
Magnesium (max)0.08%.

Dry Feeding

Cat Weight Low Activity Medium Activity High Activity
4.4 lb (2 kg) 1/4 cup (28 g) 3/8 cup (35 g) 1/2 cup (43 g)
6.6 lb (3 kg) 3/8 cup (38 g) 1/2 cup (47 g) 5/8 cup (57 g)
8.8 lb (4 kg) 1/2 cup (46 g) 5/8 cup (58 g) 3/4 cup (70 g)
11 lb (5 kg) 5/8 cup (54 g) 3/4 cup (68 g) 7/8 cup (82 g)
13.2 lb (6 kg) 5/8 cup (62 g) 7/8 cup (78 g) 1 cup (93 g)

Mixed Feeding

Cat Weight Cans / Day Low Activity Medium Activity High Activity
4.4 lb (2 kg) 1/2 1/4 cup (19 g) 1/4 cup (27 g) 3/8 cup (34 g)
6.6 lb (3 kg) 1 1/4 cup (19 g) 3/8 cup (30 g) 3/8 cup (40 g)
8.8 lb (4 kg) 1 1/4 cup (27 g) 3/8 cup (42 g) 5/8 cup (54 g)
11 lb (5 kg) 1 3/8 cup (35 g) 1/2 cup (53 g) 3/4 cup (68 g)
13.2 lb (6 kg) 1 1/2 cup (43 g) 5/8 cup (64 g) 7/8 cup (80 g)
Royal Canin Veterinary Diet Feline Urinary SO + Calm Dry Cat Food

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Customer reviews

CatMomof 3
21 Dec 2020

20 Dec 2020

Excellent food - but so hard to find

My cat would kill for this food. He absolutely tucks into it every day. He had a life-threatening run-in with crystals about 2.5 years ago and not a so single problem since. Sadly the vet I was using to get this from has moved out of area and I cannot find a single place online that carries it. I've asked another local vet and they say they can't get it. Not sure what I'm going to do about that.
Shiner girl
08 Aug 2020


My cat has done well on the urinary so calm food. My question is, do you still make the kind that says CALM on the bag? My vet can’t seem to get it, and online pet stores don’t have it.
04 Aug 2020

The diet is palatable, both wet and dry for the picky eater. I am still on the fence about how well the "Calm" aspect of the diet is doing. It may be helping some. I have had No GI issues with them, no hairballs, their coat remains soft and dander free. Even when they are off joint/coat supplements. It is a very expensive diet, which can be problematic for those who want to give their pets a good diet, but cant afford it.
07 Jul 2020

Morsels are too hard

We got some of this from a friend to try out and our cat absolutely loved it. We were having trouble getting her to eat enough of her prescription Hill's Prescription Diet c/d Multicare Urinary Stress and this food came up as an alternative. When she loved it ate it with now issues for several days, we went to the vet to get a new prescription. Then ordered the new food, only to be extremely dissapointed. She doesn't even really like this food and when she does eat it she throws it all back up. The morsels are so hard she can't chew them so she swallows them whole and then throws them back up 15 minutes after eating. I compared them to all the other foods we have(5 different ones) and they are so hard I can't break them with my fingernail, where as all others can easily be broken with your fingernails. This is not the same food we got from our friends even though it was the same exact product. There has clearly been some change or we got a bad bag.
21 Apr 2020

Great for two cats with separate needs

I have two cats - one who is very anxious and one who is prone to urinary blockages. This food is perfect for both without having to manage separate feedings for my cats. I only wish the supply chain was more consistent. When I first started with the food two years ago, the 17lb bags were regularly backordered constantly and now I'm fearing that's about to happen again.
30 Mar 2020

Avoid Blocked Males & Idiopathic Cystitis Females

I have fed CALM for years. I was so happy when RC combined CALM with Urinary SO. Please see this review's title for the reasons I feed this formula.
Royal Canin response
Great feedback, thank you for sharing!
12 Feb 2020

Saved my kitty’s life <3

I moved from Colorado to Hawaii and the stressed triggered my 10 year old male cat to start developing bladder crystals in his urine that were blocking his urethra. He was not able to urinate more than a few drops at a time. He was uncomfortable, in pain, and would go to the litter box constantly and it was so sad and scary. I was in and out of the emergency vet for DAYS trying to do whatever I could. Eventually, they told me male a lot of male cats are predisposed to this type of thing, and it is usually triggered by extremely stressful situations And doesn’t go away :( and if they can’t urinate for 24 hours their bladder can burst, which will kill them. The best option was to try this urinary and calm food and keep him on it for the rest of his life with no other food at all... but if that doesn’t work, they need too basically Slice his urethra in half ( the analogy was like turning a covered tube-like water slide into an open-air water slide) and turn him from a boy into a girl down there to allow the crystals to pass easily. I went for the food in September 2016, and within a day or two he was fine. Been on the food ever since and he’s in perfect health and stress-free. Definitely have a customer for life. This food is everything!!!!!!!!!
Royal Canin response
Tyrone is so handsome and thank you for sharing your wonderful story with us!
01 Nov 2019

Works and they love it!

My older SF with LUTD has been on this for about 5 months now, and she loves it! We are having less accidents in the house. Her behavior has changed too, used to be aggressive and now as loving as can be. The research that goes behind the food is fantastic as well! Thank you Royal Canin!
31 Oct 2019

Enjoyed by all

I have 4 cats that all really enjoy this food. I know that I don't have to worry about urinary tract infections with my cats on this food. I have had cats with urinary tract infections before, but not since they have changed to this particular food. I also give them the canned/wet food version, too. They love it!